[英]How to keep text to a texbox that binds data from a database after Postback
下面是組成 gridview 的模板字段之一。 標簽和文本框的所有值都來自數據庫,我想關注這個特定的文本框,這里是 aspx 代碼:
<asp:TemplateField HeaderText="ServiceStart" SortExpression="ServiceStart">
<EditItemTemplate>
<asp:TextBox ID="txtEditServiceStart" runat="server" type="date" Text='<%# Bind("ServiceStart","{0:d}") %>' Width="128px"></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="LblItemServiceStart" runat="server" Text='<%# Bind("ServiceStart","{0:d}") %>' ></asp:Label>
</ItemTemplate>
</asp:TemplateField>
注意 txtEditServiceStart 是 type=date
當程序在這里運行時是最初的樣子:
現在,當用戶單擊編輯時,要編輯文本框(txtEditServiceStart)的所述日期,文本框如下所示:
它顯示:mm/dd/yyyy 並且不顯示數據庫中的記錄。
但是當用戶沒有更改該文本框的值並單擊: UPDATE (基本上是為了保存更改)時,它將再次加載 gridview,問題是它不會保留文本框的日期,而是默認為: 1/1/1900。 它應該再次顯示圖 1 中的數據
請注意,當用戶編輯日期時沒有問題,它只會更新數據庫,gridview 將顯示新的值/日期。
基本上,如果用戶未編輯數據而不是顯示 1/1/1900,我只需要再次向 gridview 顯示數據
我試過使用txtEditServiceStart.Attributes.Add("readonly", "readonly");
但它不會識別我的 c# 代碼上的文本框,我認為這是因為我從數據庫綁定數據,也許程序不會運行。 我也嘗試過使用 Eval 而不是 Bind 但仍然無法正常工作
編輯:這是我如何將數據放在網格上
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
BindGrid();
}
}
public void BindGrid()
{
SQLConnect.ConnectionString = ConfigurationManager.ConnectionStrings["dbx"].ConnectionString;
SQLConnect.Open();
string sql = "Select LastName+', '+FirstName+' '+MiddleName AS EmployeeName, EMPLOYEE.EmpID, ContractNo, ContractDate, ContractDuration, ServiceStart, ContractDetails, ContractValue, Served from EMPLOYEE join SCHOLARSHIPCONTRACT ON EMPLOYEE.EmpID = SCHOLARSHIPCONTRACT.EmpID";
SqlCommand cmd = new SqlCommand(sql, SQLConnect);
SqlDataAdapter GridDA = new SqlDataAdapter(cmd);
DataSet GridDS = new DataSet();
GridDA.Fill(GridDS);
//Bind data to gridview
GridView1.DataSource = GridDS;
GridView1.DataBind();
//close connection
cmd.Dispose();
SQLConnect.Close();
以下是編輯、取消編輯、更新代碼的方法:
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "EditRow")
{
int rowIndex = ((GridViewRow)((LinkButton)e.CommandSource).NamingContainer).RowIndex;
GridView1.EditIndex = rowIndex;
BindGrid();
}
else if (e.CommandName == "CancelUpdate")
{
GridView1.EditIndex = -1;
BindGrid();
}
else if (e.CommandName == "UpdateRow")
{
int rowIndex = ((GridViewRow)((LinkButton)e.CommandSource).NamingContainer).RowIndex;
string ContractNo = ((TextBox)GridView1.Rows[rowIndex].FindControl("txtEditContractNo")).Text;
string contractDate = ((TextBox)GridView1.Rows[rowIndex].FindControl("txtEditContractDate")).Text;
string contractDuration = ((TextBox)GridView1.Rows[rowIndex].FindControl("txtEditContractDuration")).Text;
string serviceStart = ((TextBox)GridView1.Rows[rowIndex].FindControl("txtEditServiceStart")).Text;
string contractDetails = ((TextBox)GridView1.Rows[rowIndex].FindControl("txtEditContractDetails")).Text;
string contractValue = ((TextBox)GridView1.Rows[rowIndex].FindControl("txtEditContractValue")).Text;
string DropDownServed = ((DropDownList)GridView1.Rows[rowIndex].FindControl("DropDownServed")).Text;
AccessLayer.UpdateContract(ContractNo, contractDate, contractDuration, serviceStart, contractDetails, contractValue, DropDownServed);
GridView1.EditIndex = -1;
BindGrid();
}
}
AccessLayer = 更新合約:
public static int UpdateContract(string ContractNo, string ContractDate, string ContractDuration, string ServiceStart, string ContractDetails, string ContractValue, string Served)
{
string css = ConfigurationManager.ConnectionStrings["dbx"].ConnectionString;
using (SqlConnection con = new SqlConnection(css))
{
string UpdateQuery = "UPDATE SCHOLARSHIPCONTRACT SET ContractDate= @ContractDate, ContractDuration = @ContractDuration, ServiceStart = @ServiceStart, ContractDetails = @ContractDetails, ContractValue= @ContractValue, Served = @Served WHERE ContractNo =@ContractNo";
SqlCommand UpdateCmd = new SqlCommand(UpdateQuery, con);
SqlParameter paramOriginalContractNo = new SqlParameter("ContractNo", ContractNo);
UpdateCmd.Parameters.Add(paramOriginalContractNo);
SqlParameter paramContractDate = new SqlParameter("@ContractDate", ContractDate);
UpdateCmd.Parameters.Add(paramContractDate);
SqlParameter paramContractDuration = new SqlParameter("@ContractDuration", ContractDuration);
UpdateCmd.Parameters.Add(paramContractDuration);
SqlParameter paramServiceStart = new SqlParameter("@ServiceStart", ServiceStart);
UpdateCmd.Parameters.Add(paramServiceStart);
SqlParameter paramContractDetails = new SqlParameter("@ContractDetails", ContractDetails);
UpdateCmd.Parameters.Add(paramContractDetails);
SqlParameter paramContractValue = new SqlParameter("@ContractValue", ContractValue);
UpdateCmd.Parameters.Add(paramContractValue);
SqlParameter paramServed = new SqlParameter("@Served", Served);
UpdateCmd.Parameters.Add(paramServed);
con.Open();
return UpdateCmd.ExecuteNonQuery();
}
}
請建議我可以添加到 aspx 或 c# 代碼的方法/方法謝謝
你的問題是你總是更新你的ContractDate
。 您必須編輯查詢字符串。 添加COALESCE
將為 ContractDate 分配一個值: @ContractDate
如果已填充,否則分配ContractDate
的現有值。 將方法中的 ContractDate 類型更改為?DateTime
它允許您將其放入方法null
。 當您調用方法時,只需檢查文本框是否已編輯日期,如果未設置為空,則將其放入方法中。
public static int UpdateContract(string ContractNo, DateTime? ContractDate, string ContractDuration, string ServiceStart, string ContractDetails, string ContractValue, string Served)
{
string css = ConfigurationManager.ConnectionStrings["dbx"].ConnectionString;
using (SqlConnection con = new SqlConnection(css))
{
string UpdateQuery = "UPDATE SCHOLARSHIPCONTRACT SET ContractDate=COALESCE(@ContractDate=ContractDate), ContractDuration = @ContractDuration, ServiceStart = @ServiceStart, ContractDetails = @ContractDetails, ContractValue= @ContractValue, Served = @Served WHERE ContractNo =@ContractNo";
SqlCommand UpdateCmd = new SqlCommand(UpdateQuery, con);
UpdateCmd.Parameters.AddWithValue("ContractNo", ContractNo);
//Here you have to convert string to DateTime
UpdateCmd.Parameters.AddWithValue("@ContractDate", ContractDate);
UpdateCmd.Parameters.AddWithValue("@ContractDuration", ContractDuration);
UpdateCmd.Parameters.AddWithValue("@ServiceStart", ServiceStart);
UpdateCmd.Parameters.AddWithValue("@ContractDetails", ContractDetails);
UpdateCmd.Parameters.AddWithValue("@ContractValue", ContractValue);
UpdateCmd.Parameters.AddWithValue("@Served", Served);
con.Open();
return UpdateCmd.ExecuteNonQuery();
}
}
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